realm: Create RealmUserDefault object for internal realm.

We create RealmUserDefault object for internal realm just
for consistency. The code in migration does so but it
was missed to add the code when creating new internal realm.

zerver/lib/server_initialization.py

@@ -3,7 +3,14 @@ from typing import Iterable, Optional, Tuple
 from django.conf import settings
 
 from zerver.lib.bulk_create import bulk_create_users
-from zerver.models import Realm, RealmAuditLog, UserProfile, get_client, get_system_bot
+from zerver.models import (
+    Realm,
+    RealmAuditLog,
+    RealmUserDefault,
+    UserProfile,
+    get_client,
+    get_system_bot,
+)
 
 
 def server_initialized() -> bool:
@@ -17,6 +24,7 @@ def create_internal_realm() -> None:
     RealmAuditLog.objects.create(
         realm=realm, event_type=RealmAuditLog.REALM_CREATED, event_time=realm.date_created
     )
+    RealmUserDefault.objects.create(realm=realm)
 
     # Create some client objects for common requests.  Not required;
     # just ensures these get low IDs in production, and in development